The San Diego County Board of Supervisors on Tuesday advanced a $2.5 million project meant to reduce toxic air pollution at Saturn Boulevard, the South County hot spot where cascading Tijuana River flows release hydrogen sulfide into nearby neighborhoods. The board voted to adopt a memorandum of agreement with the city of San Diego, authorizing the county to advertise and award a construction contract. At the crossing, in the Nestor area near Imperial Beach, polluted river water flows during dry weather through two to three culvert pipes and spills into a downstream pond. … The project will attach high-density polyethylene pipe to two of the existing culverts. The extensions will run about 40 to 60 feet into the pond so the flow discharges below the water’s surface. The report says the extensions are designed so they will not raise flood levels.

Other Tijuana River news:

• Courthouse News: Water pollution linked to higher risk of rare brain disorder
• KOGO (San Diego): San Diego County OKs $2.5M Tijuana River pollution project